Lacking any logical meaning or sense; something that is ridiculous or makes no sense at all.
From 'nonsense' (non- + sense, from Latin 'sensus' meaning perception) plus the suffix -ical. 'Nonsense' emerged in the 1600s to mean 'words or ideas of no importance or meaning.'
The prefix 'non-' is incredibly productive in English—you can attach it to almost any noun or adjective to mean the opposite, which is why we can create words we've never heard before and still understand them!
Complete word intelligence in one call. Free tier — 50 lookups/day.